From ad8b15f0ffc297cdd6c65ef7552b3b8abd11a401 Mon Sep 17 00:00:00 2001 From: Steve French Date: Fri, 8 Aug 2008 21:10:16 +0000 Subject: [PATCH] [CIFS] list entry can not return null Signed-off-by: Steve French --- fs/cifs/cifs_debug.c | 53 +++++++++++++++------------------ fs/cifs/cifsfs.c | 71 ++++++++++++++++++++------------------------ fs/cifs/cifssmb.c | 3 +- fs/cifs/connect.c | 8 ++--- 4 files changed, 61 insertions(+), 74 deletions(-) diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c index 688a2d42153f..69a12aae91d3 100644 --- a/fs/cifs/cifs_debug.c +++ b/fs/cifs/cifs_debug.c @@ -79,27 +79,25 @@ void cifs_dump_mids(struct TCP_Server_Info *server) spin_lock(&GlobalMid_Lock); list_for_each(tmp, &server->pending_mid_q) { mid_entry = list_entry(tmp, struct mid_q_entry, qhead); - if (mid_entry) { - cERROR(1, ("State: %d Cmd: %d Pid: %d Tsk: %p Mid %d", - mid_entry->midState, - (int)mid_entry->command, - mid_entry->pid, - mid_entry->tsk, - mid_entry->mid)); + cERROR(1, ("State: %d Cmd: %d Pid: %d Tsk: %p Mid %d", + mid_entry->midState, + (int)mid_entry->command, + mid_entry->pid, + mid_entry->tsk, + mid_entry->mid)); #ifdef CONFIG_CIFS_STATS2 - cERROR(1, ("IsLarge: %d buf: %p time rcv: %ld now: %ld", - mid_entry->largeBuf, - mid_entry->resp_buf, - mid_entry->when_received, - jiffies)); + cERROR(1, ("IsLarge: %d buf: %p time rcv: %ld now: %ld", + mid_entry->largeBuf, + mid_entry->resp_buf, + mid_entry->when_received, + jiffies)); #endif /* STATS2 */ - cERROR(1, ("IsMult: %d IsEnd: %d", mid_entry->multiRsp, - mid_entry->multiEnd)); - if (mid_entry->resp_buf) { - cifs_dump_detail(mid_entry->resp_buf); - cifs_dump_mem("existing buf: ", - mid_entry->resp_buf, 62); - } + cERROR(1, ("IsMult: %d IsEnd: %d", mid_entry->multiRsp, + mid_entry->multiEnd)); + if (mid_entry->resp_buf) { + cifs_dump_detail(mid_entry->resp_buf); + cifs_dump_mem("existing buf: ", + mid_entry->resp_buf, 62); } } spin_unlock(&GlobalMid_Lock); @@ -163,16 +161,13 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v) mid_entry = list_entry(tmp1, struct mid_q_entry, qhead); - if (mid_entry) { - seq_printf(m, - "State: %d com: %d pid:" - " %d tsk: %p mid %d\n", - mid_entry->midState, - (int)mid_entry->command, - mid_entry->pid, - mid_entry->tsk, - mid_entry->mid); - } + seq_printf(m, "State: %d com: %d pid:" + " %d tsk: %p mid %d\n", + mid_entry->midState, + (int)mid_entry->command, + mid_entry->pid, + mid_entry->tsk, + mid_entry->mid); } spin_unlock(&GlobalMid_Lock); } diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 1ec7076f7b24..e8da4ee761b5 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -930,36 +930,34 @@ static int cifs_oplock_thread(void *dummyarg) schedule_timeout(39*HZ); } else { oplock_item = list_entry(GlobalOplock_Q.next, - struct oplock_q_entry, qhead); - if (oplock_item) { - cFYI(1, ("found oplock item to write out")); - pTcon = oplock_item->tcon; - inode = oplock_item->pinode; - netfid = oplock_item->netfid; - spin_unlock(&GlobalMid_Lock); - DeleteOplockQEntry(oplock_item); - /* can not grab inode sem here since it would + struct oplock_q_entry, qhead); + cFYI(1, ("found oplock item to write out")); + pTcon = oplock_item->tcon; + inode = oplock_item->pinode; + netfid = oplock_item->netfid; + spin_unlock(&GlobalMid_Lock); + DeleteOplockQEntry(oplock_item); + /* can not grab inode sem here since it would deadlock when oplock received on delete since vfs_unlink holds the i_mutex across the call */ - /* mutex_lock(&inode->i_mutex);*/ - if (S_ISREG(inode->i_mode)) { - rc = - filemap_fdatawrite(inode->i_mapping); - if (CIFS_I(inode)->clientCanCacheRead - == 0) { - waitrc = filemap_fdatawait(inode->i_mapping); - invalidate_remote_inode(inode); - } - if (rc == 0) - rc = waitrc; - } else - rc = 0; - /* mutex_unlock(&inode->i_mutex);*/ - if (rc) - CIFS_I(inode)->write_behind_rc = rc; - cFYI(1, ("Oplock flush inode %p rc %d", - inode, rc)); + /* mutex_lock(&inode->i_mutex);*/ + if (S_ISREG(inode->i_mode)) { + rc = filemap_fdatawrite(inode->i_mapping); + if (CIFS_I(inode)->clientCanCacheRead == 0) { + waitrc = filemap_fdatawait( + inode->i_mapping); + invalidate_remote_inode(inode); + } + if (rc == 0) + rc = waitrc; + } else + rc = 0; + /* mutex_unlock(&inode->i_mutex);*/ + if (rc) + CIFS_I(inode)->write_behind_rc = rc; + cFYI(1, ("Oplock flush inode %p rc %d", + inode, rc)); /* releasing stale oplock after recent reconnect of smb session using a now incorrect file @@ -967,15 +965,13 @@ static int cifs_oplock_thread(void *dummyarg) not bother sending an oplock release if session to server still is disconnected since oplock already released by the server in that case */ - if (pTcon->tidStatus != CifsNeedReconnect) { - rc = CIFSSMBLock(0, pTcon, netfid, - 0 /* len */ , 0 /* offset */, 0, - 0, LOCKING_ANDX_OPLOCK_RELEASE, - false /* wait flag */); - cFYI(1, ("Oplock release rc = %d", rc)); - } - } else - spin_unlock(&GlobalMid_Lock); + if (pTcon->tidStatus != CifsNeedReconnect) { + rc = CIFSSMBLock(0, pTcon, netfid, + 0 /* len */ , 0 /* offset */, 0, + 0, LOCKING_ANDX_OPLOCK_RELEASE, + false /* wait flag */); + cFYI(1, ("Oplock release rc = %d", rc)); + } set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(1); /* yield in case q were corrupt */ } @@ -1001,8 +997,7 @@ static int cifs_dnotify_thread(void *dummyarg) list_for_each(tmp, &GlobalSMBSessionList) { ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList); - if (ses && ses->server && - atomic_read(&ses->server->inFlight)) + if (ses->server && atomic_read(&ses->server->inFlight)) wake_up_all(&ses->server->response_q); } read_unlock(&GlobalSMBSeslock); diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 6e8e8fc04c02..994de7c90474 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -128,8 +128,7 @@ static void mark_open_files_invalid(struct cifsTconInfo *pTcon) write_lock(&GlobalSMBSeslock); list_for_each_safe(tmp, tmp1, &pTcon->openFileList) { open_file = list_entry(tmp, struct cifsFileInfo, tlist); - if (open_file) - open_file->invalidHandle = true; + open_file->invalidHandle = true; } write_unlock(&GlobalSMBSeslock); /* BB Add call to invalidate_inodes(sb) for all superblocks mounted diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index ff4345db7201..0711db65afe8 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -151,7 +151,7 @@ cifs_reconnect(struct TCP_Server_Info *server) } list_for_each(tmp, &GlobalTreeConnectionList) { tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList); - if ((tcon) && (tcon->ses) && (tcon->ses->server == server)) + if ((tcon->ses) && (tcon->ses->server == server)) tcon->tidStatus = CifsNeedReconnect; } read_unlock(&GlobalSMBSeslock); @@ -173,14 +173,12 @@ cifs_reconnect(struct TCP_Server_Info *server) mid_entry = list_entry(tmp, struct mid_q_entry, qhead); - if (mid_entry) { - if (mid_entry->midState == MID_REQUEST_SUBMITTED) { + if (mid_entry->midState == MID_REQUEST_SUBMITTED) { /* Mark other intransit requests as needing retry so we do not immediately mark the session bad again (ie after we reconnect below) as they timeout too */ - mid_entry->midState = MID_RETRY_NEEDED; - } + mid_entry->midState = MID_RETRY_NEEDED; } } spin_unlock(&GlobalMid_Lock); -- 2.20.1